[kandem]

I thought that a BOV was supposed to allow the turbo to keep spooling, keep pressures and temps down, AND make noise. So there is absolutely zero benefeit for having one at all besides making noise? I like the noise, always have. But if I was wrong, then, I just won't get one. why is a K&N drop in better than a CAI? I understand about the plastic manifold being better due to engine heat soak.
Are hard pipes worth it?
What about the exhaust? I don't want to sound like a crappy automatic with a fart can on. I do like the tone of the factory, even though it may be restrictive.
Thanks for the additional info on the ignition, and thermostat.